lacks bunch of currencies for conversion, only converts between two values
KZT, UZS, KGS are absent in currency list
when convert it's a lost oportunity to show conversion in multiple currencies at once instead of converting just between a pairs of two, and then manually switching from one to another
the better UX is to have a user selected table of currencies where each has input and adding value into one field will automatically convert the sum into other currencies on the table
+1 — I’d love to see TWD (New Taiwan Dollar) included as well.
Another calculator app (Unitto) offers a wide variety of currencies; I checked and noticed that it uses this API (link), just for your reference.
Thank you for creating such a practical and beautiful app!